From: Guenter Roeck <linux@roeck-us.net>
Date: Sat, 1 Jun 2024 13:44:47 +0000 (-0700)
Subject: i2c: smbus: Support DDR5 and LPDDR5 SPD EEPROMs
X-Git-Tag: v6.11-rc1~212^2~52
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=84d477354b0a3c3a2cd154cd2cd4d7fd6188f9f2;p=thirdparty%2Flinux.git

i2c: smbus: Support DDR5 and LPDDR5 SPD EEPROMs

Detect (LP)DDR5 memory and instantiate the SPD5118 driver automatically.

Suggested-by: Thomas Weißschuh <linux@weissschuh.net>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---

diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c
index 97f338b123b11..f809f0ef20044 100644
--- a/drivers/i2c/i2c-smbus.c
+++ b/drivers/i2c/i2c-smbus.c
@@ -308,7 +308,7 @@ EXPORT_SYMBOL_GPL(i2c_free_slave_host_notify_device);
  * target systems are the same.
  * Restrictions to automatic SPD instantiation:
  *  - Only works if all filled slots have the same memory type
- *  - Only works for DDR, DDR2, DDR3 and DDR4 for now
+ *  - Only works for (LP)DDR memory types up to DDR5
  *  - Only works on systems with 1 to 8 memory slots
  */
 #if IS_ENABLED(CONFIG_DMI)
@@ -382,6 +382,10 @@ void i2c_register_spd(struct i2c_adapter *adap)
 	case 0x1E:	/* LPDDR4 */
 		name = "ee1004";
 		break;
+	case 0x22:	/* DDR5 */
+	case 0x23:	/* LPDDR5 */
+		name = "spd5118";
+		break;
 	default:
 		dev_info(&adap->dev,
 			 "Memory type 0x%02x not supported yet, not instantiating SPD\n",